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8-1 Message: Write a function called display_message (), which prints a sentence indicating what you learned in this chapter. Call this function to confirm that the displayed message is correct. ?影片主要讲述了盛世年间，道医林萧和亲传弟子田小邪为了清除恐怖的神秘病毒，解救天下苍生而经历一系列磨难的故事。范文轲谦逊道：真是惭愧啊，汉王言重了。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:电视剧《杜鹃山》讲述的是在秋收起义的巨大影响下，湘赣边界杜鹃山，有一支农民自卫军揭竿而起，三起三落，濒于覆灭。农民自卫军领袖雷刚急盼找到中国共产党人，为他们找到出路。1928年春，共产党组织派柯湘前来与他们联系。柯湘途中被捕，农民自卫军在刑场上营救了她。柯湘把农民自卫军改编成为自卫军，用无产阶级建军思想对部队进行改造。期间他们与地主武装头子毒蛇胆斗志斗勇，经历无数波折，终于，自卫军会合红军主力，消灭了敌人，正式改编为工农革命军。开赴井冈山，去与毛委员领导的红军主力会师。第四季的剧情会围绕变成吸血鬼的Elena展开。变身让她想起了和之前被Damen抹去的记忆，这会是她和Stefan的关系产生新的裂痕。附身到Tyler身上的klaus和Caroline之间到底有怎样的进展？真正的Tyler又去哪了呢？Elena在知道真相后又会有怎样的举动？而Jeremy面对变成吸血鬼的姐姐会有什么反应，Elena自己又如何接受这样的事实呢？